Subslot-based HARQ-ACK timing and PUCCH resource determination for ultra-low latency PDSCH transmission
A user equipment (UE) is described. The UE includes a higher layer processor configured to determine HARQ-ACK feedback timing for HARQ-ACK feedback of ultra-reliable low-latency communication (URLLC) physical downlink shared channel (PDSCH) transmissions with a subslot structure. The higher layer processor is also configured to determine a physical uplink control channel (PUCCH) resource for the HARQ-ACK feedback. The UE also includes transmitting circuitry configured to transmit the HARQ-ACK feedback for the URLLC PDSCH transmissions based on the HARQ-ACK feedback timing and the PUCCH resource.
1. A user equipment (UE), comprising:
a higher layer processor configured to:
determine a hybrid automatic repeat request-acknowledgment (HARQ-ACK) feedback timing of a HARQ-ACK feedback for ultra-reliable low-latency communication (URLLC) physical downlink shared channel (PDSCH) transmissions based on a subslot structure; and
determine a physical uplink control channel (PUCCH) resource with a starting symbol index for the HARQ-ACK feedback; and
transmitting circuitry configured to transmit the HARQ-ACK feedback for the URLLC PDSCH transmissions based on the HARQ-ACK feedback timing and the PUCCH resource having the subslot structure, wherein:
a subslot duration and the subslot structure are determined based on an uplink subslot duration in a PUCCH configuration,
the starting symbol index is determined based on the subslot structure,
a PDSCH-to-HARQ-timing indicator indicates a number of subslots, and
the HARQ-ACK feedback is transmitted, after the number of subslots, starting from an end of the URLLC PDSCH transmissions.
2. The UE of claim 1 , wherein the HARQ-ACK feedback timing is determined based on an explicit timing indication.
3. The UE of claim 1 , wherein the HARQ-ACK feedback timing is further determined based on a pre-defined or configured HARQ-ACK timing table.
4. The UE of claim 3 , wherein a timing in the HARQ-ACK timing table corresponds to modulation and coding scheme (MCS) settings or transport block (TB) sizes.
5. The UE of claim 3 , wherein a timing in the HARQ-ACK timing table is determined based on a number of symbols in a PDSCH transmission or based on a PDSCH duration.
6. The UE of claim 3 , wherein a timing in the HARQ-ACK timing table is determined based on a UE capability.
7. A base station (BS), comprising:
transmitting circuitry configured to:
transmit radio resource control (RRC) signaling to configure a hybrid automatic repeat request-acknowledgment (HARQ-ACK) feedback timing of a HARQ-ACK feedback for ultra-reliable low-latency communication (URLLC) physical downlink shared channel (PDSCH) transmissions, a subslot structure; and
determine a physical uplink control channel (PUCCH) resource with a starting symbol index for the HARQ-ACK feedback; and
receiving circuitry configured to receive the HARQ-ACK feedback for the URLLC PDSCH transmissions based on the HARQ-ACK feedback timing and the PUCCH resource having the subslot structure, wherein:
a subslot duration and the subslot structure are determined based on an uplink subslot duration in a PUCCH configuration,
the starting symbol index is determined based on the subslot structure,
a PDSCH-to-HARQ-timing indicator indicates a number of subslots, and the HARQ-ACK feedback is received, after the number of subslots, starting from an end of the URLLC PDSCH transmissions.
8. The BS of claim 7 , wherein the HARQ-ACK feedback timing is determined based on an explicit timing indication.
9. The BS of claim 7 , wherein the HARQ-ACK feedback timing is further determined based on a pre-defined or configured HARQ-ACK timing table.
10. The BS of claim 9 , wherein a timing in the HARQ-ACK timing table corresponds to modulation and coding scheme (MCS) settings or transport block (TB) sizes.
11. The BS of claim 9 , wherein a timing in the HARQ-ACK timing table is determined based on a number of symbols in a PDSCH transmission or based on a PDSCH duration.
12. The BS of claim 9 , wherein a timing in the HARQ-ACK timing table is determined based on a UE capability.
13. A method performed by a user equipment (UE), the method comprising:
determining a hybrid automatic repeat request-acknowledgment (HARQ-ACK) feedback timing of a HARQ-ACK feedback for ultra-reliable low-latency communication (URLLC) physical downlink shared channel (PDSCH) transmissions based on a subslot structure;
determining a physical uplink control channel (PUCCH) resource with a starting symbol index for the HARQ-ACK feedback; and
transmitting the HARQ-ACK feedback for the URLLC PDSCH transmissions based on the HARQ-ACK feedback timing and the PUCCH resource having the subslot structure, wherein:
a subslot duration and the subslot structure are determined based on an uplink subslot duration in a PUCCH configuration,
the starting symbol index is determined based on the subslot structure,
a PDSCH-to-HARQ-timing indicator indicates a number of subslots, and
the HARQ-ACK feedback is transmitted, after the number of subslots, starting from an end of the URLLC PDSCH transmissions.